Copper-nickel sulfide ore concentrate smelting method through pyrometallurgy

Abstract

The invention relates to a copper-nickel sulfide ore concentrate smelting method through the pyrometallurgy and particularly relates to improvement of the process for smelting the copper-nickel sulfide ore concentrate through the pyrometallurgy. According to the invention, during the process of transferring smelting slag to a sedimentation electric furnace from a smelting furnace, the reduction slagging reaction of magnetic iron oxide is completed in a chute, so that oxides of nickel, copper and cobalt in the slag are vulcanized and converted into sulphonium. The method provided by the invention has the advantages as follows: the depletion of smelting slag and adjustment of slag types can be completed in the reaction chute, so that the operation of the sedimentation electric furnace is facilitated, and the waste slag discharged from the electric furnace contains less valuable metal, and the metal recovery rate is increased; the smelting slag flows through the reaction chute to adjust the types of slag, so that the smelting slag, which does not contain high magnetic iron oxides or copper-nickel oxides, can be subjected to the smelting process so as to product high-grade sulphonium; the separation of iron and copper nickel is completed during the process of smelting, the blowing of white matte is non-slag smelting, so that the low-air pollution is not caused, and the difficulties of treatment of blowing slag are avoided.

Description

technical field [0001] The invention relates to a pyrometallurgy method of copper-nickel sulfide concentrate, which relates to an improvement of a process for pyrometallurgy of copper-nickel sulfide concentrate. Background technique [0002] The most typical smelting process of non-ferrous metal sulfide ore is the smelting of copper sulfide concentrate and nickel sulfide concentrate. From copper sulfide concentrate to blister copper, the current process is to make matte and smelt in an oxygen-enriched smelting furnace to produce ordinary copper matte (containing Cu45-70%) and smelting slag, and to blow copper matte to produce blister copper. The blowing slag is produced, and the smelting slag is sent to the settling electric furnace with an open chute for reduction, vulcanization, clarification and separation operations, and finally the electric furnace slag with a copper content of less than 0.5% is discharged. Some factories also slowly cool and grind the electric furnace ...

AI Technical Summary

Problems solved by technology

The main problems in this process flow and equipment configuration are: (1) low metal recovery rate

The main problems in this process flow and equipment configuration are: (1) low metal recovery rate

Due to the use of oxygen-enriched enhanced smelting, there are more magnetic iron oxides and magnesium oxides in the smelting slag, the properties of the slag deteriorate, and the chemically dissolved nickel-copper-cobalt oxides in the slag are also high. This leads to severe knotting in the electric furnace and a reduction in the effective settlement space. Although the slag has been reduced and vulcanized in the subsidence electric furnace, due to the poor reaction kinetics, the adjustment of the slag type is limited, and the temperature of the electric furnace is increased. The agitation of the body disturbs the clarification and separation of slag and matte, making it difficult to obtain electric furnace waste slag with low valence metal content; (2) It is difficult to adjust the slag type of smelting slag

The salient feature of the nickel smelting slag type is high MgO, which leads to a high melting point of the slag. Adding more slagging agents to reduce the proportion of MgO in the slag can change the melting point of the slag. Technically, it can be done, but there will be a large amount of slag and leaching. The problem of corroding refractory bricks is limited in production

(3) The open chute has the disadvantage of reducing slag temperature and high maintenance cost

Nickel smelting slag flows through the open chute to the entrance of the sinking electric furnace, and the temperature of the slag drops by about 50°C. For the sinking electric furnace, the temperature drop of the slag with a high melting point makes it difficult to operate

In addition, baking the chute, cleaning slagging, and repairing the inner lining are all regular, requiring a lot of manpower and material resources.

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